Antigravity Extension Install

This skill covers installing custom extensions into Antigravity (the forked VS Code editor used across this workspace) and configuring per-workspace status bar buttons.

Antigravity Editor Overview

Antigravity is a VS Code fork used across all machines in this ecosystem. It stores data in:

[!IMPORTANT] Always install into Antigravity, not VS Code. The CLI fallback chain is:

1. •/Applications/Antigravity.app/Contents/Resources/app/bin/antigravity
2. •/Applications/Cursor.app/Contents/Resources/app/bin/code
3. •/Applications/Visual Studio Code.app/Contents/Resources/app/bin/code

Custom Extensions

All custom extensions live in the command-center repo at:

command-center/extensions/
├── cross-agent-bridge/     # Delivers cross-agent messages to Gemini
│   ├── extension.js        # Main extension code
│   ├── package.json        # publisher: "command-center", name: "cross-agent-bridge"
│   ├── install.sh          # Self-contained installer script
│   └── *.vsix              # Pre-built packages (v1.0→2.0.3)
├── launch-button/          # Status bar launch buttons
│   ├── extension.js        # Reads .vscode/status-buttons.json
│   └── package.json        # publisher: "antigravity", name: "status-bar-buttons"
└── stack-prompt-bridge/    # Sends prompts to Gemini from external sources
    ├── extension.js
    └── package.json        # publisher: "stack-architect", name: "stack-prompt-bridge"

Extension Identity Format

The installed folder name follows: {publisher}.{name}-{version}

How to Install an Extension

Method 1: Via CLI (preferred)

If the extension has a .vsix package:

# Find the Antigravity CLI
ANTIGRAVITY_CLI="/Applications/Antigravity.app/Contents/Resources/app/bin/antigravity"

# Install from VSIX
"$ANTIGRAVITY_CLI" --install-extension path/to/extension.vsix --force

# Verify
"$ANTIGRAVITY_CLI" --list-extensions | grep extension-name

Method 2: Direct Copy (for simple extensions without VSIX)

For extensions that are just extension.js + package.json (like launch-button):

// turbo

1. •Read the extension's package.json to get publisher and name and version

// turbo 2. Copy the extension folder to ~/.antigravity/extensions/:

# Format: {publisher}.{name}-{version}
cp -r path/to/extension ~/.antigravity/extensions/{publisher}.{name}-{version}

1. •

   The extensions.json manifest will be auto-updated by Antigravity on next launch. No manual editing required.

2. •

   Restart Antigravity: Cmd+Shift+P → "Developer: Reload Window"

Method 3: Using install.sh (cross-agent-bridge only)

cd command-center/extensions/cross-agent-bridge
./install.sh

This packages a fresh .vsix and installs via CLI automatically.

Installing on Remote Machines

To install an extension on a remote machine via SSH:

# Copy extension to remote
scp -r extensions/launch-button anthonywright@Anthonys-MacBook-Air.local:/tmp/

# Install via SSH
ssh anthonywright@Anthonys-MacBook-Air.local \
    'cp -r /tmp/launch-button ~/.antigravity/extensions/antigravity.status-bar-buttons-1.0.0'

Status Bar Buttons

The launch-button extension reads .vscode/status-buttons.json from each workspace to create clickable status bar buttons.

Config Format

Create .vscode/status-buttons.json in any workspace:

{
    "buttons": [
        {
            "label": "Launch",
            "icon": "rocket",
            "command": "npm start",
            "tooltip": "Launch Application",
            "color": "#4ade80",
            "terminalName": "App Name"
        }
    ]
}

Config Options

Existing Configs

Creating for Other Repos

Electron apps should use their launch command:

{ "command": "npm start", "tooltip": "Launch [App Name]" }

Web apps with dev servers:

{ "command": "npm run dev", "tooltip": "Start [App Name] Dev Server", "icon": "play" }

Extension Manifest (extensions.json)

[!CAUTION] Do NOT manually edit ~/.antigravity/extensions/extensions.json. Antigravity manages it automatically. Only use direct copy (Method 2) for extension files — the manifest updates on next launch.

Manifest Entry Format (reference only)

{
    "identifier": { "id": "publisher.name" },
    "version": "1.0.0",
    "location": {
        "$mid": 1,
        "path": "/Users/anthonywright/.antigravity/extensions/publisher.name-1.0.0",
        "scheme": "file"
    },
    "relativeLocation": "publisher.name-1.0.0",
    "metadata": {
        "installedTimestamp": 1770398312825,
        "source": "vsix"
    }
}

Machine Ecosystem

Network Config

Machine hostnames for SSH are stored in ~/.gemini/antigravity/network-config.json:

{
    "machines": [
        { "name": "macbook-pro", "host": "localhost", "type": "local" },
        { "name": "macbook-air", "host": "Anthonys-MacBook-Air.local", "user": "anthonywright", "type": "ssh" },
        { "name": "mac-mini", "host": "Anthonys-Mac-mini.local", "user": "anthonywright", "type": "ssh" }
    ]
}

[!IMPORTANT] Always use .local (mDNS/Bonjour) hostnames, never hardcoded IPs. DHCP can reassign IPs when machines reconnect. The .local hostname resolves dynamically via Bonjour.

Polyrepo Ecosystem

All repos live at ~/Developer/Antigravity Apps/:

Legacy Extension (Deprecated)

The vscode-extension/ folder at the repo root contains an older TypeScript-based extension (command-center-bridge v0.1.0). This was superseded by cross-agent-bridge. Do not use or install it.